[kergonath]

This is a fallacious position. The modern attitude of “you’re not one of us, therefore you cannot possibly have a valid opinion” is wrong on many levels.

It is not logically consistent (a variation of ad hominem arguments).

It is counter productive because having a range of opinions helps avoiding echo chambers and have a broader outlook and understanding, and ultimately find better solutions and strategies.

It opens the door to no true Scotsman sterile arguments that are very easy to use in bad faith against people you disagree with.

It creates counter-productive dissent when people who actually agree on an idea or policy don’t work together for ideological reasons.

Don’t do it.