ShadesOfMe wrote:
My brother has his girlfriend over. They came out of his room, and said they were watching "robot chicken" I said "urg, i hate that show"
Was it necessary to share that information? Were they asking you to watch? Sure this was your opinion and "truth". But not all truths need to be spoken. Same thing with pointing out that Robot Chicken is "horrible". Extraneous information. It could be truth (it certainly is a defendable subjective opinion in this case

) but the need to be said might be low.
The guess about tone of voice that someone had earlier is likely a good one, or it could be that and body language. Another guess could be the context of whether or not you have talked about this before. If you repeat this sort of thing too much, negative opinions of things or about Robot Chicken itself and the repetition tends to be seen in a poorer light. A whiner.
Or you live with some over-sensitive and/or hypocritical jerks.

Or you unknowingly annoyed them or did something rude earlier in the day and exhausted your share of good will. Or they were having a bad day, or there was some other stress at play for them. *shrug* Plus being overly defensive/offensive around the feelings of a GF/BF isn't unheard of. They way you describe it it their reaction sounds a bit overblown. But really hard to say without being there and without more info from your brother and mother.
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Please be kind and patient with the tourist. He comes in peace and with good intentions.