First, it is more cordial. Personally, I think Mr. Huang Gray is kinder than Mr. Huang Lei, and naturally he is not so stiff and tidy. Especially in the environment of the yearning mushroom house, it seems that neighbors come to visit. It can't be said that it is a lack of respect, but it reduces a sense of alienation and makes it more intimate and familiar. Besides, I don't think Mr. Huang's title is disrespectful. In another extreme variety challenge, members there generally call Mr. Huang Mr. directly. Isn't this a kind expression? Can you call it disrespect?
Second, they may have a good relationship. Zhao plays the leading role in Extreme Challenge. Let's not talk about the quality and reputation of the film. First, they must know each other. Maybe they are friendly and familiar with each other when they are not known to the outside world, so they don't care much about what to call them. Just to express their cordial familiarity. Since they are two people we know, compared with the younger generation that Mr. Huang is unfamiliar with, they are still more cordial. So since Mr. Huang doesn't mind such a name, what is the audience still entangled in?
Third, maybe that's what they call it in private. Mr. Huang, Mr. Wang and Mr. Lei are all honorifics. I don't think Mr. Huang Lei thinks that Zhao doesn't respect him just because of his address, so people may meet in private in this way, which makes people feel familiar. As an outside observer, there is no need to dwell too much on the address. I think all three appellations can reflect the feeling of respect.
The above is my humble opinion. If readers have any comments on Zhao's calling Mr. Huang Lei Mr. Huang, they can post them in the comments section.