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You would more than likely get warned or muted, if the comment is reported. I mean, you can, but that doesn't mean you should. Maybe give constructive criticism on why it apparently “sucks”.

Depends, if you’re talking about someone or their creation on this site, no. If it’s not something someone could be offended by, such as “the weather conditions suck”, that might be okay.

Its allowed if its not towards a user (aka “this guy named testman393844 sucks” is probably not allowed idk)

Thanks im making a new project and i needed to know if i can say it

Yes, but not for people.
homework is an example. i hate homework

You can have your characters say stuff like “School sucks” or “Homework sucks” or “It sucks that it's boiling hot outside”, but of course, any inappropriate phrases that both go against the Community Guidelines and are against a specific gender or identity are not allowed.

Yeah. Just don't insult people.

How come the phrase “you suck” is not allowed?

Quintino17 wrote:

(#9)
How come the phrase “you suck” is not allowed?

1. If you have a question, please post it in a new topic.
2. Because it's quite disrespectful.

Quintino17 wrote:

How come the phrase “you suck” is not allowed?

Because you're not allowed to be disrespectful on Scratch.