I never liked Top Gear. My son went through a phase if watching it when he was maybe 12ish, so I saw quite a few episodes and thought he was childish and unpleasant even then (20 years or so ago). He seems to have made a career by appealing to the 'we can't say anything now, he's only saying what everyone is thinking, there are too many snowflakes' brigade.
The comments made to Baggs for not picking up on a KKK reference are unreasonable if in fact Clarkson's reference was to GoT, and not the KKK. Regardless of whether he was picking up on a race-related thing or a fictional 'fantasy' one, what he said was appalling, which is what Baggs was saying, I think.
I really hope this has been a step too far, and he is sacked. I'm all for freedom of expression, but there is opinion and there is invective, and this is very firmly in the latter category, IMO.