People have to be careful when making criticisms online because these days, everyone is on the Internet. Every celebrity, author, expert and scholar is online, and all of them can see everything. This means that if someone makes a claim they don't know everything about, it's easy for the expert to chime in and correct them.

The embarrassing part is when people speak back without realizing they definitely don't know as much as that person does. Usually, someone who asks "Don't you know who I am?" comes off as pretentious and rude, but in these cases, it is warranted. This kind of thing happens a lot online, and it's always funny when it does.

Reddit's "Don't You Know Who I Am?" is a community where people share screenshots of all the cringeworthy times people haven't realized who they are talking to. It gets pretty awkward over there.

Here are just 24 of those terrible moments.