I think what Booker did was extraordinary on several levels. First, the sheer physical endurance it takes to speak for that long, almost uninterrupted, while remaining cogent, is absolutely incredible. Second, the actual content of what he said, based on what I've seen, was fantastic; he was impassioned, engaging and incisive, and the extent to which he kept on topic over that many hours is staggering. Third, the fact that he broke the record for the longest speech on the Senate floor, which is not only an achievement in its own right, but doubly meaningful given his status as a Black man when the previous record was set by a segregationist, Strom Thurmond, protesting the Civil Rights Act in 1957. And last but not least, the moral clarity inherent in rebuking, loudly and at length, the myriad abuses of a historically corrupt, fascist government while working to delay their business.
All that being so, I think there are only three plausible reasons for someone finding Booker's speech disrespectful. The first is predicated on agreeing so completely with the Trump administration's policies that disrupting their operation via a lawful, established form of political protest is cast as inherently bad - which would be very much in keeping with the logic of those who, to take just one example, see nothing illegal or indeed remarkable about Trump's insistence that the executive branch should be able to unilaterally overrule both the Senate and the judiciary. The second is predicated on being such a spineless appeasenik milquetoast that some nebulous concept of "civility" is considered more important, and thus more urgent, than doing literally anything to protest an administration so nakedly corrupt that the president is publicly shilling for crypto and Tesla in order to line his own pockets. And the third is, simply, racism, whether subconscious or overt, which here translates to the reflexive assumption that a Black man being loud and disruptive must of course be inherently bad, and certainly a worse offense than whatever he might be protesting.
So, in conclusion, no, I do not think Booker's speech was disrespectful - but even if it could be fairly labelled as such, as I don't believe this current administration is remotely deserving of anyone's respect, I'd still be cheering him on.