The Ricoh boos has always happened since day 1.
When Wasps first moved in the did some good PR with the local schools and clubs, lots of free tickets etc. I think a large section of the crowd was/is new to rugby.. 
I've been a few times (I live in Solihull), and It's always a bit cringy, as the opening post said...they boo everything. Even last season Marler was annoying the home crowd and at one stage during the match He was being seen to by a physio for an injury, the game had paused so time was "off"....He was being slow clapped, which I did think at the time was bad.
I don't enjoy going to Ricoh (geographically My nearest Prem club), so I don't go except for the Quins match and the Tiger match (teenage son is a Tiger supporter)

On a completely different note, nice touch by Mike Brown to give his match shirt to a youngster after the game, chatting to Him and His Dad on the bus back to the station....it was their first away game, so they had a good end to their visit.