Does this constitute harassment?

[DarmaniLink]

I'm a new player. I've been leveling all my DoH/DoLs so I can be self sufficient. I don't run out and farm everything because I don't have time to play all week. This winds up getting very expensive.

I find an item that I can craft for 1k and sell for 100k that's apparently used as a glamor item. I throw one one the mb and try selling another in shout chat. Someone else sees it and mentions undercutting me. I ask him not to because I'm trying to make up losses from leveling DoH stuff.

He comes by and waves at me, I check the mb a bit later and he's flooded it with like 15 of that item for 10k/each.

I don't consider undercutting harassment, but this is fully intentional to bother someone. [context in the conversation, not posting in full] Someone who's already established screwing over someone who's getting started and making it impossible for them to buy them out. These items sell less than 2 a day.