That would indeed be the ideal, but I know enough people for whom statements like these have a real impact, me included. As you pointed out, they are ignorant and insecure, and IMO stifle actual technical discourse. Their only purpose is for their author to somehow feel better at the expense of other people.
Not everybody has the thick skin and confidence they belong in tech that you have, and it for sure is always nicer to have a constructive exchange than having to face adversity. I want people to be like the person that kindly pointed out SICP to me rather than someone blasting me for using global variables. The first was much more effective.
You can't control other people, you can only control how you react to them, or maybe how much interaction you have with them. You can call it a thick skin, but it comes down to evaluating criticism from other people and deciding if it means anything to you or not. Do you have any reason to take their opinion seriously? Do they direct their comments at you, personally, or just throw out stuff like "PHP sucks" to stir the pot?
Of course we would live in a nicer world if no one made ignorant or mean comments but we don't live in that world so we have to adapt and decide how we respond to other people.
Not everybody has the thick skin and confidence they belong in tech that you have, and it for sure is always nicer to have a constructive exchange than having to face adversity. I want people to be like the person that kindly pointed out SICP to me rather than someone blasting me for using global variables. The first was much more effective.