I don't fancy blonde men at all. I never have.
I think that's fair enough.
I don't discriminate against them when it comes to work, I haven't avoided serving them when I have worked in shops, I don't think unpleasant things about them when I see them on the street, I don't shout stuff at them, attack them or their children, I don't try to stab them or put dogshit through their letterbox.
All I do is a. not chat them up and b. not reciprocate when they try to chat me up
So if this not fancying blonde men thing is a prejuduce, it's not exactly a very world shattering one, is it. If we're going to talk about prejudice and discrimination, the actions it conjures up (and actions are important) are around negative consequences for the person discriminated against which are fairly serious. People stepping away, being unfriendly, not selling them stuff, not hiring or promoting them, attacking them with words or fists or objects.
If the only area in which you are discriminating is in your choice not to fuck a certain type of person, discrimination seems to be a terribly strong word. The impact on the person is they don't have sex with you, and they go and find sex with someone else (if they're lucky). And people do have sexual preferences, they do discriminate (if you will) when it comes to sexual partners on a variety of things. I don't think this can be compared, paralleled to the sort of discriminatory practices that are outlawed in the equality act, or hate crimes, for example.
In my case, I discriminate against blonde men. I also discriminate against blonde women, and actually all women, as I'm straight.
Interestingly, while sex is very important to me, and genitals (and I am a bit boggled at the claim that "You must have a really fucking two-dimensional view of sex if you think which particular genitals are involved is so key to the outcome or experience" because erm yes really they do), I am really not at all fussed about the gender of the person I have sex with.
There is a bit of a whiff of "women must have sex with who others say they have sex with, and if they don't want to then they are some kind of horrible bigot" about this, and I don't like it. Women have always struggled to be allowed the right to choose their own sexual partners, and something about this thread feels really off to me.