Sounds like the extremist christians who basically tell you how you're going to burn in hell if you don't change your sinful ways or the Islamics who will, in fact, murder you, if you don't believe that their religion is the only religion… sounds like some bronies take things way too seriously to be quite honest.

Anyone who tries to force people to like things that they don't is going to be annoying, full stop.
There are plenty of bronies that do this, but it is by no means exclusive to us nor are they the majority.
That said, I've seen people complain about ponies when a couple posters have pony avatar pictures in a non-pony thread.
To some people, simply having to see any reference to ponies in any way constitutes having it 'shoved down their throat' so I can't really take the complaints too seriously.