What he's saying is that in his opinion people look down on justbbguns because it caters for backyard skirmishing as well as airsofting.
However, let me correct you and say the reason proper skirmishers/Airsofters look down on it is because people buy a £35 gun, go to a skirmish only to find out their outclassed even by the hire guns and then the gun breaks 20 minutes in. Or turning up to a skirmish with a springer pistol. Its not false advertising, there just isn't the knowledge among new players that those guns arn't good enough.
Its not justbbguns either, theres a few shops like this. (Also justbbguns have only just started their professional range on which I cannot comment as I have no experience).
It gives Airsoft a bad name when people new to the sport don't realise the distinction between indoor/back garden guns and the proper £150+ guns that are most often used. I mean look at some of the guns people have upgraded here, some people have spent well over £1000 on a single build.
If you want proof of any of the above just take a look at some of the older posts, there's probably over 100 asking I'm going to start airsoft, is this gun good? - with a link to a shotgun or a springer pistol worth about £25
In the end I can only go by my personal experience, I'm all for people messing around with cheap guns, its just when they arrive at a site and realise they've wasted over £50 which would be much more useful put towards a proper gun. Usually these people are the shortest on cash anyway.