To be fair this is not a Reddit thing and it can be found in the fediverse too. I can remember some of such situations where a person just posted wrong stuff but in a very confident way. I was able to prove him wrong later but nobody cared anymore.

Wait… there is a different C than C#?

I assume she was excited about all the cool stuff you could make with it and found out it was actually just a cake… Would be disappointed too.