You can. And by the way, check how French are doing accent in their series. Spoiler: they don't. It's seen as racist. Yes, the way other people are cherry picking other accents is seen as racist. Roger Murtaugh has no accent for example.

Of course, it's for fun you do it. Of course we still do funny things with accents. But in little groups where the context is clear (for fun or a group of racist shitbags). To quote a dead man (Desproges): "you can laugh about everything but not with everyone". Thus not on a broadcasted channel.

Just remember that there are other cultures.

Hey, you see. I haven't been offensive. It's because I think that some times, it's good to explain things in a detached way. Now, I can say that discussions about racism is just a joke in (current, let's see if something better comes next) DnD. Not sure that accent is the problem: even when Darth Vador has a German accent to put a biiig clue of how the empire looks like the Nazis people are able to miss it.

What?

https://en.m.wikipedia.org/wiki/Racism

Racism is discrimination and prejudice against people based on their race or ethnicity.

https://en.m.wikipedia.org/wiki/Ethnicity

An ethnicity or ethnic group is a grouping of people who identify with each other on the basis of perceived shared attributes that distinguish them from other groups. Those attributes can include a common nation of origin, or common sets of ancestry, traditions, language, history, society, religion, or social treatment.

It's possible to be racist towards anyone. If you're white go spend a couple of months in China and you'll understand that after being told by multiple people that intelligence varies by skin colour and white people are in the bottom half.