Is saying "pissed off" considered a swear word to you?

I was at work and I said the phrase “the customers might get pissed off if we…” and right afterward a older man (roughly 65) said to me we need to watch out language when the store is open.

Is it just me? But I don’t consider “pissed off” to be bad. Or a curse word for that matter.

Is it a generational thing? Do you consider it a nono is everyday speech?