The whole King Lawson thing goes way beyond when he was head of house. Him and his group have the entitled attitude this season.
They don't like Travis as he's an alpha type guy who doesn't fall into their group mentality. So they see him as competition for their dominance. The thing is, I don't think Travis cares about this.
However his relationship with Aisha, especially given her originally partnered with Lawson is clearly a big issue of contention. As if she was lost to Team Travis.
The whole money thing, we have seen Ryan and Lawson talking about how Aisha should be giving him 'respect' for the rest of the game because he 'gave' her the money. This attitude comes because they believe people should owe alliances to them, but no one else, as their group is king.
Look at Sam getting shitty at Travis, mischaracterizing Travis as being all macho and aggressive when he wasn't. This comes from their shared alpha male group perceived threat. Talking all, 'we're in here as individuals.' Which is bullshit as they all have a strong little alliance and are playing together. How they see themselves in the house entitle them to this. Sandra is in this group, most of them haven't been up, they don't care about others being up but can't stand the fact that they see them self running the show and are now up.
Remember Ryan see's himself as a jock and the rest as geeks that have taken over.
Aisha is upset at Lawson because he is trying to laud it over her that she should owe him constant loyalty and respect. As if he bought her for the rest of the show. With how he sees himself in the show, he probably does think he gave her 20 grand. When really they won a task together and in the moment for whatever reason he made a decision to let big brother give her the larger share. When this happened though, he took charge, dolled out the money as if it was his. You take 20 and we give jake 5. Lawson played the game and probably thinks he made a mistake. Maybe he's upset because he doesn't know a better way to have played that situation.
However Aisha is her own person and wasn't bought. Obviously there is a lot of passive aggressive stuff. As Travis is an Alpha they are targeting him. How else would Aisha not favour them, not because she is her own person, but because Travis is stopping. So back to Sam saying Travis needs to let her be an individual. Ironically they are blaming Travis for not letting Aisha be her own person, when she actually is being her own person and that is what they can't stand. They want her to easily follow and be subservient to them.
Aisha is kind of hard to pin down, she seems kind of innocent, naive and she's young. But she's stronger and more independent that the 'cool' group give her credit for.
In summary Sam, Ryan, Sandra, Lawson are all dickheads who think everything should revolve around them.