As many people have mentioned, this is just a very bad take.
He signed a contract with the White Sox. They are thus far the only organization to give him a shot at the ML level. He gave them an incredible start to the season, and the White Sox did plenty to help turn him into a star. The LaRussa stuff happened and I've made my thoughts very clear on that. However, Yermin going back down to AAA was all on Yermin. If anything, the Sox gave him more rope than normal seeing as he really can't play a position and if he's only paid to hit, batting .140 or whatever he did from May on probably isn't going to keep you on a lot of ML rosters.
But most importantly...handle yourself like a professional. Ask the team for a trade. I'd be shocked if Hahn and Co. wouldn't try and seek that out for him. Don't bail and "retire" because you're unhappy, then have your family members take to social media to explain the situation. Because this doesn't seem like a mental thing at this point, it seems like a "I'm not a AAA ball player anymore, this is bullshit, I want to play somewhere else and since I haven't gotten my way, I'm going to take my ball and go home." type situation, which I just can't get behind.