。
I got harassed by a weird old guy at the izakaya.
Literal
Izakaya [at-で] weird [attributive-な] old-man [by-に] was-harassed-[passive-られた].
Casual complaint. 居酒屋 ('izakaya, Japanese pub/tavern') is a central fixture of Japanese nightlife — serving drinks and small dishes. おっさん ('old man, middle-aged dude,' casual/slightly dismissive). からむ ('to pick a fight with, to get entangled with, to hassle') — specifically describing a drunk or belligerent person harassing someone. The passive marks the speaker as the one being bothered.