You’re not supposed to, but especially with United away games for example you’ll find there’s plenty of reds in among the home fans. It’s not technically allowed, it’s definitely not safe, but people do it all the time. I’ve done it a few times, I expect other fans of big clubs do it.

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Bottom line is don’t be a dick and don’t get caught, because there are plenty of parts of plenty of grounds where you’ll wish the stewards threw you out if you get caught by the home fans.

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I mean they won’t kill you or anything but you might get a bunch of locals dogpile on you and give you a shoeing. I’ve seen a few in my time but you really have to do something idiotic like celebrating a goal to provoke a violent reaction.