It does serve a purpose. It announces to everyone in their vicinity that this fragile human is deficient and should only be interacted with via great caution.
edit: I don't understand the downvotes here. Is it considered poor manners to point out that people don't get to control how people perceive them?
Maybe you should state more explicitly the premise, which is that if you are easily offended you might have a weak mind. I think it is reasonable to discuss this point, as it may have some merit.
edit: I don't understand the downvotes here. Is it considered poor manners to point out that people don't get to control how people perceive them?