you're right, zebra. the athletics hierarchy in this country stinks and the people that run it are horrendous, in my experience.
when i did my level 1 it was exactly the same. the tutor had absolutely no time for endurance runners and as far as he was concerned harrier clubs were a blot on the landscape that should be wiped out. in his eyes, if you're not a track athlete, you're nothing. my years and years of competitive cycling counted for nothing, and my sporting achievements were systematically derided in front of the other students (not a track athlete, see?) this wasn't just me, it was the same for most of the candidates from harrier clubs. this was all apparently acceptable to him.
you didn't, by any chance, do this course in the north east, did you?
the level 2 was run by a club endurance coach and the atmos was totally different. so in fairness not everybody involved in Uk Athletics is a jerk.
having said all that, the club where i coach is making progress and the teams are winning races, with people placing regularly in age categories. so, ignore this idiot and do what you wanted to train to do. it's their problem if they can't win medals (they're obviously terrible coaches) - our problem is a different one.
go and do it mate. 5K's not too far and it'll be over quickly. you'll love it - the first time anybody runs with a number on in a crowd of people all running in the same direction is unforgettable. it's totally different from 'training', if you know what i mean. go on, you rebel!