I’m sorry to see you go, but I appreciate everything you did for the project, and wish you luck in your future endeavors.

I hope Tatoeba can become a better environment for new contributors.

sabretou, I'm sorry to hear that you're encountering a hostile environment at Tatoeba. You are valuable to us, and I hope we can resolve whatever issues you are confronting so that we can persuade you to stay. I sent you a private message.

Dear sabretou,

I hope you are still coming back to find these responses. Please do answer Alan's message so we can resolve the issues. As he said, you are valuable to us, and it would be very, very sad to see you leave like this. Please don't let 10 years end this abruptly.

Yes, @Sabretou, please do stay and continue working to help make Tatoeba an even better and more welcoming place. I am in awe of your contributions to date; I also joined Tatoeba about ten years ago and have contributed less than a tenth as many sentences as you have. I am cisgender, straight, white, Anglo-Saxon and Caucasian, but I have no tolerance whatsoever for hatred and opprobrium grounded in a desire to arbitrarily and artificially elevate oneself by degrading anyone else.

I am so very sorry that you are finding instances of transphobia, homophobia, xenophobia and racism on this site — appallingly, some of it, as you say, from actual corpus maintainers. I trust that over 95 percent of all contributors to Tatoeba will be as disgusted as I am with any comments or sentences expressing archaic, loathsome and hate-grounded views that seek only to divide the Tatoeba community and to lend support to fascistic narrow-mindedness.

Such sentences, when they occasionally rear their ugly heads, should, in my opnion, be ruthlessly eliminated by the admin staff or, if they have any redeemeable element, be rewritten to emphasize the disapproval of the Tatoeba community. For example, we might recast the loathsome and unacceptable sentence #8734076; salvaged, it might read like this, which I think would be much more respectful and healthier for civil discourse on Tatoeba:

When Karen said that queer adoption is a sort of child abuse, Tom pointed out that the Bible says nothing about gay parents adopting children. "Furthermore," he argued, "over 17 million children worldwide have neither father nor mother, and they would unquestionably be better off with two loving parents. Whether those parents are gay or straight should not matter in the slightest."

If people collect heinous and unacceptable sentences and notify me, I would be more than happy to recommend improvements along such lines to the admins or, alternatively, to pronounce them unsalvageable and recommend their immediate deletion.

We should not find any serious objection arising to this remedy on spurious free-speech grounds, as one person's civil rights must end at the point where they interfere with the civil rights of others, and no individual or group should be abused by calculated repetion of poisonous comment.

If we get a promise from the admins to purge Tatoeba of hostile sentences, could we persuade you, @Sabretou, to resume your yeoman service to world culture and peace among nations?

— Objectivesea (Victoria, B.C., Canada)

10 years is a long time. I'm only here for about 3 and a half years. (this isn't my first account) And I think I learned what is Tatoeba to me. It took me some time, I quit 3 times, but I'm still here. And now I don't accept any other answer from myself to "why I would leave Tatoeba" than "I don't want to translate sentences here anymore".
Haters will be haters at the end of the day, but I will do what I want, and I want to translate sentences, try some ideas. Others do the same, there is no one who is really in control. So trying to control or regulate the flow of hateful sentences may can be not just difficult, but impossible. Still, can be light in the dark.

I do tolerate everything, but I do not translate what I don't like, so by contributing I might regulate something.
And you can do the same by doing something, anything.