So true. Half of my facebook friends think I'm a flaming liberal. The other half think I'm a flaming conservative. This is because I dare to challenge their silly meme posters that lie about and defame the "opposition". They don't seem to notice that I challenge the BS on both sides. They only know that correcting falsehoods that align with their pet belief is proof you're in the enemy camp.
Likewise, they think it's impossible to concede any point made by the enemy, no matter how obviously true, without being entirely aligned with them.