You're fully entitled to hit your head against a wall but I wouldn't recommend it.
Yes, you've made several replies stating that you didn't like the words used, they were ageist and sexist but you also said (about the OP):
I knew she was using the term negatively. She wasn't using it as in 'is this grandma chic?' she was using it to mean 'yuck, old'.
How did you know this? Or was this possibly just what you thought she meant?
I didn't take OPs post to mean this. Is it just a case of interpretation? The way I read it, OP was looking at the bedding and asking if it was old fashioned / something like your granny would have i.e. Granny-ish. She was calling the bedding granny-ish. She wasn't going on a rampage calling all women over 50s old hags/witches/dried up barren old prunes.
I just can't get offended at someone calling bedding granny-ish.
Does that make me inferior to you because you are offended and feel you know more about internalised misogyny and sexism than everyone who doesn't share your view? Because that's how you are coming across on this thread.