Earlier quoted context omitted.
Calling a product a piece of shit is perfectly acceptable behavior, it often is a reasonable and accurate opinion about a product and definitely meets the standards of the "level of decorum" expected for customer product reviews. Customers shouldn't be absolved of having a minimum level of decorum, but that minimum is at the level of (a) personal insults at specific people ("Bob in customer support is a piece of shit…
No, I'm sorry, that is not perfectly acceptable behaviour. It's not illegal - but it's also not helpful, or constructive, and nor is it desirable if you're trying to build a helpful community. There are other ways of getting your point across, without resorting to insults such as "piece of s*it". In Chinese, we might call this 家教 - or "upbringing". If you have no decorum, or class - it suggests that your upbringing w…
It's impressive that you're able to extrapolate the questioners life up until this point based on three words.
If the product in question is a shitty product, there's no problem describing it as such.