A lot of people. A lot. Not all.
A lot as in most people, which is why assuming the relationship is meant to be exclusive makes the most sense.
I can't believe this.
You are ardently supporting polyphobic people, homophobic people, and, in general, all majority groups who engage in minority discrimination... and, afaict, you don't even realize what you're doing.
You really need to rethink your argument. Or your worldview. Or both. Or everything.
Start by working on your understanding of logical thought (and your orthography); then we can talk.
Spare me the straw man, please.
Are you sure you don't want her to spare you the illicit major, or the persuasive definition, or the double counting, or the survivorship bias?
Nene is right. Brush up on Logic 101. It will do you good.