This is just the plain truth. Fanboys can get annoying because of the following reasons I've experienced:
- Their fierce loyalty can also cause them to mock the other franchise like how Tanba mocks Takeru and Genta in Shinkenger.
- They openly bash the other franchise in a very degrading manner. I've experienced that.
- If that is not all, cultural biases can come in as well. I've read how PR fans make degrading comments about Super Sentai and vice-versa. It's just like "It's Japanese, ugh." or "It's American, ugh." There has also been some racist attacks against Asians done by some white Americans and vice-versa. Just try watching "The Bruce Lee Story" to see what I mean.