Two things can be true at once.
TLR was 100% wrong in how he handled the 3-0 count/HR situation with Yermin. Basically the entire roster sided with Yermin over Tony. It was dumb then and it's still dumb now.
Under no circumstance should that situation lead someone to retire from the sport. Yermin had an incredible 6 week run or whatever it was, but decided he was "above" making adjustments at the plate, wanted to keep doing his own thing, and it led to him going back to AAA. If TLR throwing him under the bus was really his mental downfall, he didn't have much of a future with MLB to start with...
I wish the best for him, he's clearing upset with something and if he's not happy....go find that happiness.