I loved your post, I agree with you, just because you met one person with certain characteristics doesn't mean that an entire population is that way, that's the big problem with generalization and stigmas. I loved when you said you would go out of your way to prove otherwise, although I really don't think such an effort is necessary.
If you are congruent with what you profess and your beliefs it is something that will come naturally, and everyone who knows you will realize that. Too bad you had that experience with that man, but you know what? He didn't deserve you! and you have been spared from being with a person who is unsure of himself.
Thank you for sharing your experience with us 🙏