Let's apply a little perspective. I don't think that "railroad" is anywhere close to being on the level as an offensive joke. It's not a term being used to describe or used against other peoples and cultures, particularly marginalized or foreign ones. It's not even being used jokingly. It's a term used to talk about roleplaying games, and one way how they are structured for campaign play. Obviously there is more to it than that, but comparing it to an offensive joke is a false equivalence IMHO that tries to make a hobby term as being comparable to causing harm and insult to others, again often marginalized groups.
Likewise, "metagaming" has also been used a pejorative, and I don't think it's as malicious as people make it out to be, and how people understand "metagaming" has also been changing in the hobby as they reconsider its use.
FWIW, the board gaming hobby uses the term "Ameritrash" to describe a style of game. It can certainly be used pejoratively, but it's mostly lost any teeth it had as a pejorative. However, there are a fair number of games that are openly and brazenly referred to as "Ameritrash" games. I guess there are likely people who find reason to be offended by the term.