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Miraculous Ladybug is a french children cartoon, and as such never tackles the topic of racism head-on. It does however bring up the topic subtly at times (namely in the episodes Bakerix & Qilin) and I found these interesting enough to point out.

Bakerix

So, TL;DR for those who have never watched the show and/or this episode: the protagonist (Marinette) is biracial, chinese mom & white (french/italian) dad. The Bakerix episode focuses on her efforts to get her grandfather to talk to the family again after some events made him break ties with everyone.

Now, every character explains this behavior with an awkward "well, he's very attached to traditions, uhhh ask your [mom/grandma/father] to tell you more." The event in question, textually, is that Marinette's dad added rice flour to his bread recipe, which her grandpa perceived as a break from tradition and hated enough to sever all contacts with her dad for twenty years.

Subtextually, grandpa stopped talking to everyone around the time his son married a chinese woman, has a picture of the wedding of Marinette's parents in his house he keeps face-down to never look at it, is mad over rice flour, and no one wants to spell out his fucking problems to Marinette. So I think I can safely say the actual implied problem is "dude's fucking racist." Which I personally find to be a very clever way to explain the issue to kids.

(In general I really like how the show portrays Marinette and her connection, or lack of thereof, with her roots, but that's neither here nor there.)

Qilin

Qilin, aka the acab episode, involves a serie of unlikely event ending with Marinette's mom getting caught on a bus without a ticket or an ID. Meaning now she has to pay a fine, go do an ID check at the police station, and gets handcuffed wrongly.

Mind you, this could just be the show hyperboling things to emphasize that the situation is truly unfair (it's a cartoon for 7yos. They're not subtle about things. If they want you to know a situation is wrong or a character is evil, they go all out.) But personally I can't help but read into the fact that a Chinese immigrant is asked to come do an ID check- especially considering irl in France, people of color are way more likely to be targetted by law enforcement for these sorts of ID controls.