This is the same bollocks that led to a friend of mine who is South Korean getting racially abused in Madrid. He is a regular match goer and earned those credits the same as anyone but Liverpool fans racially abused one of their own because he looked "wrong".
Can fuck off anyone who is saying that it isn't racism to say to target the "line of 10 Chinese people". People of all backgrounds and races get tickets from touts or off mates which, as rightly noted above, closes off access to away tickets for others.
I would be interested to see the proof that it was Liverpool, not Shrewsbury, who instigated the checks.
I do understand your frustration with getting checked as it has disrupted your day and affected your enjoyment of it, but a bit of care over how you phrase things would be advised as it reads as something quite racist.
I am not conflating the two in terms of severity, but the attitude of targeting people who "look like they shouldn't be there" (not quoting you, just making clear these are not my words) is the same reason why stop and search targets BAME people. Targeting anyone based on race or an arbitrary determination of them being more likely to be "guilty" is a serious problem in our society and is wrong. No other way about it.