Why do people assume?

I often ask relationship questions like most of us on here but I find it strange for people to make assumptions right off the bat.

1) Because I am over 35 I am an old crusty woman
2) Just because I was put in the friendzone I must be ugly
3) Since I am unlucky in love I must never date or go out and make friends
4) Because I am upset about the way women are treated (ie rape) that I am a raging feminist with no regards for men.

I could go on and on. Just wonder why people have such narrow views.
Why do people assume?
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