What's the difference between 8,000 followers and 40 following? 40 seems a bit more realistic about how many care about what he has to say.
Do you understand how Twitter works? 8000+ people follow him to read his posts, so they care to some degree (even if a few those just follow to mock him or whatever). Many respond to him when he posts, so your assertion that 'nobody' cares is just wrong. Just say that YOU don't care what he posts, it's a valid opinion.
Justin only follows 40 people himself because it's all he has time for. I don't know if those same 40 people even follow him. In fact, I know at least one of them doesn't.
Ashley Fisher needs attention: http://twitter.com/ashley_fisher75