Gaslighting?

[PerkyOchrePeer]

I am going on holiday to meet up with someone and I told somebody about this and they said to me you already mentioned this to me and I'm like no I've not told you before I don't remember telling you.

Why would somebody insists that I've already told them about going to meet this person on holiday when clearly I didn't say this to them before and when I was telling them it was the first time I'd mentioned it to them

No I do not think this is gaslighting same as the other 99% of the times the label is used, they may have just mixed up thoughts

Maybe you did tell them and forgot?
Maybe they’re lying or just not that interested?

Either way it’s absolutely not gaslighting and hardly worth starting a thread on

It doesn't sound like gas lighting.

It sounds like you told them before and forgot. Or they heard it from someone else and think they heard it from you. A misunderstanding.

Simple mistakes are not gaslighting.
People who use gaslighting are seriously disturbed individuals who use toxic manipulation strategies to knowingly and purposely make you believe that you're crazy or forgetful, with the end goal of wrecking your self esteem so much that they can now abuse you indefinitely without the risk of you leaving them.
A simple case of mishearing, misunderstanding or misremembering something doesn't check any of these boxes.
Can we all stop dramatising simple human interactions?

Swap "hardly worth starting a thread "to not worth starting a thread. This is such a none event I envy the op's for having so few worries in her life.