If i can slip in a quick PSA while my typically sleepy notifications are exploding, these are all very annoying things to say and you might want to reconsider whether they're worth ever saying in a reply directed at someone else - who are they for? what do they add?

• "why are you surprised"/"even worse than {thing} itself is people being surprised at {thing}": unless the person is saying "i am surprised by this" they are likely not surprised by the thing. just saying something doesn't mean you are surprised by it, and people talking about something usually have paid attention to it before the moment you are encountering them. this is pointless hostility to people who are saying something you supposedly agree with so much that you think everyone should already believe it
• "it's always been like this": slightly different than above. unless someone is saying "this is literally new and nothing like this has happened before" or you are adding actual historical context that you know for sure they don't already know, you're basically saying "hey did you know this thing you care enough about to be paying attention to and talking about frequently has happened before now as well." this is so easy to frame in a way that says "yes and" rather than "i assume you dont know about the things i know about due to being very smart." eg. "dang not again, they keep doing {thing}"
• "{thing} might be bad, but {alternative/unrelated, unmentioned, non-mutually exclusive thing} is even worse": multiple things can be bad at the same time and not mentioning something does not mean i don't think it's also bad
• "funny how people who think {thing} is bad also think {alternative/unrelated, unmentioned thing} is good": closely related to the above, just because you have binarized your thinking does not mean everyone else has.

anyway if the mental image you are conjuring for your interlocuters positions them as always knowing less than you by default, that might be something to look into in yourself!