Right wing propagandists are rarely deplatformed compared to the other two groups and when they are it's generally for spreading conspiracy theories (remember that people have already died because of Pizzagate and QAnon "truthers") or inciting (racial/religious/homophobic) hatred.
The difference is that right wing propagandists are also a lot more vocal than the other group (or left wingers for that matter), skewing the perception. There's a widely known joke about how many comedians have shows on mainstream platforms with titles like "Cancelled" or "Triggered", complaining about "things you can't say anymore". Also see the "Intellectual Dark Web" whose whole shtick is being "deplatformed" by academia and the mainstream while having a massive mainstream media presence.