Reigns gets booed at NXT house shows when he's showed on-screen or mentioned, too. At the Concord NXT show after Mania, there was a marriage proposal and the guy said they named their kid after Reigns. The crowd booed and demanded that she say no (she said yes and the crowd cheered, but still). People don't like Reigns because he's shoved down their throats and booked exactly like Cena when he shouldn't be in, in an area where fans are smart enough to know who's being booked and why.
Him being suspended is justification for those people.
For me, personally, I think Reigns sucks. I'm happy he got suspended, but I'm going to be pissed when they brush this under the rug like it didn't even happen. And it's going to make me hate him more.