Seriously - why the mocking of the Co-exist sticker?

I am only guessing but some feel their religion is the only true faith and all others are false. Again that’s just what I am guessing and I don't speak for everyone and every religion.

That's a pretty broad brush. Would it include Christians and Jews?

this is the only real co-exist dumper sticker.

Nice!

This is a generalization but much like you said, there are people that proudly display this stick only to flip off another driver, cut me off while I am riding my bike, and are intolerant of others that don't share their views.  Not everyone...but many.

Much like here in Colorado we have a "Respect Life" license plate that I believe was introduced after the Columbine tragedy.  Nice idea, and every one should respct life.  However, I am cut off by another vehicle while driving my family through the mountains and I notice the have  RL license plate...I see some irony.  They are showing no respect for anyone. 

Anyway, if a person really believes in the message, live it and proudly display whatever you want to on your vehicle.  Otherwise, you are looking like a fool!

I roll my eyes at just about any sticker.  I'm not sure why someone needs to tell everyone that they support these things.  Whether it is the coexist sticker, the fish thing, your political views or that your kid is an honor student.  I don't care.  Now it really doesn't bother me that much, but is worthy of an eye roll.  

Now if you have a USAT sticker or MDot, 26.2, 13.1, etc, That's different....

When I get cut off in traffic and flipped the bird there is a good 50/50 chance they will have a Coexist or Peace symbol on their car somewhere.

why?  Because haters gonna hate:

Pretty much this.  Race stickers can be tacky enough but the ones that really get me to roll my eyes are those such as coexist, church stickers, darwin fish, baby on board, etc.  I believe for myself, it's just the idea that, in my experience, those that advertise some belief system have a tendency to take a "holier than thou" attitude and/or have some self entitlement "I'm special" issues.  Sometimes I'd like to knock on their window and inform them that nobody really cares about their belief or that they have 17 children, two dogs and a turtle according to their family stickers but at the end of the day I don't really care enough to be bothered with doing so

Wait, people or getting upset about a bumper sticker?

I guess I have too many important things to do than to worry about a bumper sticker.  Like watching paint dry or water boil or the "off the air" color bars on tv.

Unless it's a 140.6 sticker, I don't give a rat's arse.

There aren't a ton of them around Omaha, but as others have mentioned the eye roll for me is when the person exhibits the exact opposite in actions as to what the bumper sticker espouses.

I'll also say that I have the same reaction when I see a Christian fish on a car that's speeding or cutting people off.

Now for the gun Coexist sticker.  It's full of awesome.

Oh, and don't forget:

Funny how EVERY religion holds it as tenant that all the other faiths are false and fictious but none are willing to entertain the idea that all religions could be fictious. 

Except those are not religions.

But they are not religions.