Because I find his habit of rolling a die to decide which group he'll be pandering to this week annoying, insulting, and un-presidential?
This. His views and statements regarding the War on Drugs and pointing out the disproportionate amount of minorities in prison for drug offenses is just to pander to those minorities, particularly African Americans. His views and statements on foreign policy is just pandering to the non-interventionist "doves," particularly those on the far left who have hated Hillary ever since she voted for the war over a decade ago. Breaking with your party on a limited amount of issues doesn't mean that the other side will come and embrace you with open arms. I'd imagine the reason most red avatars "hate" Paul is just because of that: his platform, ideology and party contradicts most everything that red avatars believe. Wondering why so many red avatars despise Paul is like wondering why so many blue avatars on here "hate" Hillary.
I just can't see how he thinks he can pander so much based on these issues, because I don't think many Americans' first priority is ending the War on Drugs or non-interventionism (or foreign policy in general, for that matter), but if that's his strategy, go right ahead.
