I’m pretty sure this is a universal human trait not exclusive to Chareidim. Someone on the CR just recently posted a link to an article which showed that there is a clear trend in MO circles to look down at chareidim.
I don’t disagree with your point. It’s not a “human” trait though, it’s due to non-exposure to people unlike yourself, and/or feeling threatened. MO are “threatened” by Charaidim (who for example are trying to take over EY and impose their own version of Halacha). Charaidim are threatened by the MO (they can stop supporting the Charaidim, as we see happening in EY). So both sides look down on each other.
Part of Ahavas Yisroel is to be aware that there are multiple valid paths to Avodas Hashem, and not to judge why or how an individual is reaching towards the Ribbono Shel Olam.
The Torah in many places makes it clear that looking down at anyone is wrong. May we all be zocheh to conquer that Yetzer Hora.
Ken Yehi Ratzon.