To be fair, Frankie is pretty short. :P
MyChem were asked about it and they were confused because they had run into Marilyn a few times, and every time he was really nice and friendly to their faces, didn't seem to have a problem with them at all. So Gerard, when asked in an interview about it, said he figured Marilyn was just saying shit because he had a record to promote.
And yeah, recently Frank went right up to him and asked him what was up and Marilyn said nothing, so they figured everything was cool.
Marilyn used to frustrate me because I really liked his music and style, but he always seemed to spend too much time trying to offend the Religious Right, which honestly is pretty much the easiest group of people to offend.
Then after awhile I just got bored with him and stopped caring.
Here is a classic from The Onion some years back:
http://www.theonion.com/content/node/28771