Dude, I met 2 girls ( one Romanian and one from Columbia ) that put the condom on my penis using their mouthI've sampled enough women to know the difference. She was also the best head-giver by far, normally I can't even orgasm from head.
I will not come here and say that Romanians are Columbians are good at giving head only because I had an experience like that coming from them. Those were simply outliers
Giving good head or being amazing in the sack comes from a lot of experience. Same as it is with the guys, the more experience you have the better you will be in the sack. You skill has nothing to do with your ethnicity or stuff like that
And that thing with other girls can not handle you is a big stretch too. Maybe they were not that into you to begin with so they just wanted you to finish your deed as soon as possible
Girls if they are not frigid or something, would want you to bang the sh1t out of them all night long if they are into you or if you are good at what you are doing. Women are freaks by default