> “Don’t be so sure of yourself, short man!” The problem is that it's still socially acceptable to see short stature as some objective faux-pas. There's really no difference between a person proudly declaring they only like "white" people and a person declaring they only like "tall" people. If the guy said "Don't be so sure of yourself, black man" maybe it would have been acceptable in the 1920s, but it surely isn't…
Different from skin colour, there's an evolutionary trait to height preference. Studies have shown that heterosexual women prefer partners taller than them. It's understandable this subconscious bias. And what seems like discrimination, it's just a natural product.
Similarly, men have always shown preference to larger breasts and hips, signs of fertility. We can't, even shouldn't, shut down our instincts due to politically correctness.