I’m sure there’s a way to whitelist accounts with this extension, and if there’s not it will quickly follow. If I had a Twitter account this extension would already be installed alongside the Drumpfinator and “Make Drumpf Tweets Eight Again”.
In general, my “groupthink echo chamber” can do very well without the comments made by a racist grifter’s marks. This is why the Discourse Mute Greasemonkey/Tampermonkey script is useful to me here (at least on desktop browsers).
ETA: Yes, it has a whitelist:
View blocking receipts and add protected users by right clicking the extension’s icon and choosing “Options.”