Trash talking other's faith can be an effective defense mechanism. If the "trash talkee" takes offense (or their heads explode) then the "trash talker" can usually assume that the "trash talkee" really doesn't have much of a strong faith basis to begin with.
I'm sorry, but no.
I belong to a belief system that gets 'trash talked' a LOT. Evangelicals especially like to do that. there are anti-Mormon sites all over the internet devoted to nothing BUT 'trash talking' my beliefs....but you won't find Mormon sites out there trash talking anybody ELSE'S beliefs.
We have people who stand in front of our Temples and events who demonstrate against them, who turn up their loud speakers to drown out the events, who desecrate our religious symbols and make fun of them, who literally block the entrances to our meetings.
Shoot, one of 'em spent a fair amount of time at my husband's funeral sticking fuzzy paper pamphlets (you know the sort...red and black line drawings with great big bold font) saying 'the deceased is in hell and you will follow him if you don't leave the devil Mormon church!
............we all thought it was funny. I still have my copy. I don't think the pamphlet passer outer got the reaction he expected, but that didn't change his INTENT, now, did it?
The problem with 'trash talking,' is that it doesn't END there. People who 'trash talk' escalate to physical action...and some of it is considerably nastier than blocking entrances to meetings or very loud speakers. Some of it becomes mob murder, attempts to block a US senator from talking his seat BECAUSE OF HIS RELIGION, violence and discrimination of all types.
Do NOT assume that someone whose beliefs are being 'trash talked' don't have a strong belief to begin with. It would be better to assume that someone who objects to having his deeply held beliefs mocked, denigrated and 'trash talked' has a right to object to that level of disrespect and assininity, especially since it can, and does, so often lead to worse things.
Unless you think that "the Protocols of the Elders of Zion" or "Jews and their lies" is just dandy? This stuff ALWAYS leads to nasty things.
You don't need to be 'politically correct.' You DO need to pick the time, place, and treat the other guy the way you want your own opinions and beliefs to be treated.