It's always best to avoid making fun of someone's physical appearance... especially when you're no oil painting yourself.
A fan responded to former WWE US champion Baron Corbin by calling him out for "squandering his opportunities" and brought up the fact that he's going a little thin on top while he was at it - but the Lone Wolf is the not the type of man to let something like that slide, and fired right back.
Corbin has never been shy about expressing his feelings on social media, and it's reportedly landed him in hot water with WWE in the past. Still, something tells me this particular exchange won't come in for much backlash.