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Old Trafford isn't anymore the stronghold it used to be.
I can see why you're saying this with the way they lost to Brighton and they haven't been that convincing in their home wins. It's still 1 loss out of 3 so I wouldn't come to that conclusion yet. Smaller teams may have lost their fear and respect to a certain extent playing at Old Trafford but I think MU will still manage to win most of their home games.
Aside the game Brighton played against united is not the only reason that dude made that statement of Old Trafford, the whole thing was rated by there performance, since thing season started Manchester united have not been the self and instead of them to start solving there problem, they are acting has if they don't care. And the way smaller teams are looking very dangerous, posing a challenge to practically every club. Even though West Ham did not win, I was impressed with the manner in which they played Manchester City. Manchester United will be doomed this season unless they improve their performance next week.