Just Because You Put The Badge On, It Doesn't Suddenly Make Your Car An ///M

So, the story is, this guy put an S50 into his non-M E30, and put the M badge on his car, and I commented that it shouldn't have the badge on account of it not being an M. As you can see, some people get really defensive about it being on there [my username is the same on the pic as it is here]