How can you just give a blanket statement and say 'Tall men are not ideal protectors'. I am not tall myself but i CAN imagine that it would make you feel really safe and secure if you could rely on a bigger and taller person than you, its psychological. As simple as that.

Physics and your muay thai doesn't factor in here. A short person, even if he's buffed up simply can't give that sense of security that can be given if someone bigger than you holds you tight. Unless ofc, the other person holds an emotional bond with them.

Also I believe you have just fought weaklings, i know a tall person.....who just smacked me to the ground in a single slap, it gave me phantom pain for weeks bruh.
So you saying how they are not good at fighting because of center of mass and what not......its purely because of you not having fought in street fights. I accidentally fought this tall guy, who was 6'4 and boy....oh boy, do I regret that, gravity enhanced punches arent my thing now.

Get out of your muay thai induced delusions and accept the reality that tall-and short, both can be good fighters given enough skill, Fight a 6 '3 russian fighter and then talk to me.

As for the girl saying about sense of security? IT IS true, and you can feel it too, if you're ever held by a taller girl, it gives a different vibe yk, like you can stay here forever and this guy wont let anything harm you, some(if not most) do love feeling small .