@Keetonman
"Female tsundere beats the male MC and constantly berates and humiliates him in front of everyone" -beloved anime/manga franchise
"Male tsundere treats the female MC with care and only says anything negative about her in his thoughts" -Asshole
It's because these young insecure gentlemen wanted to self insert into the male MC so they wanted him to look absolutely perfect without blemish whatsoever.
On the other hand for the female tsundere case, they like to fantasize that the girls IRL who hates them actually likes them similar with the tsundere heroines. I've seen an acquintance so delusional did that and it looks pitiful to be honest, he didn't understand that the girls are actually creeped out by him...
Guy: *did something creepy*
Girl: *genuinely creeped out and pissed off*
Guy: "She's just being tsundere, she's not actually angry."
Me: "... Actually, no. But whatever makes you happy dude..."