Dealt with a lot of this crap on Saturday. I do a 6AM skate where it's typically the same group of guys out there every week. Always a few guys who randomly show up, but they fit in well. Saturday had one kid, 13 or 14 years old who broke some major rules. No defense, stuck himself at the red line the whole time. When any of us would get the puck you'd immediately hear him calling for it. At the beginning, some would actually pass to him, where he'd just puck hog the whole time (never, ever passed). Eventually we caught on and most outright refused to pass it to him. Excessively long shifts....five minutes or more. Most of us are older (a few midgets...then the age range goes up into the 40's...majority of us are later 20's to early 40's) and we'd try to tell him at this drop-in we emphasize quick shifts to give everyone equal time...never listened. Celebrated every goal he scored like it was game 7. The goalies there Saturday were about 50 years old. They come out to have fun and to give us something better than posts to shoot at....I can only imagine having some little kid act cocky for scoring on a cherry-picked breakaway in shinny would be rather frustrating for them.
Last 10 minutes of the two hour session, most of us just want one last shift, he stays out there for the whole 10 minutes until the Zamboni doors open. Then when coming off the ice he brags "I scored three times on one shift".
What's worse than all that is the fact his dad was there watching, and actually came over giving him shit for bad play a couple of times. Instead of teaching his son about etiquette and sportsmanship, he's griping at him for any little thing he did wrong and actually threatened him with 'running X miles' if he did it again. So...I guess that's where it comes from.
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With regard to slapshots, I think it's all judgement. Never take a slapper into traffic. If it's just you and the goalie, you're at decent distance, and you aren't head hunting with your shot, then go for it. I've never heard of a goalie actually complain about someone taking a slapshot at them. The one thing I ALWAYS hear about are when drop-in sessions turn into never ending breakaways with cherry pickers. Goalies hate that shit, and I don't blame them. For me, I don't go to shinny for breakaways, and luckily the sessions I regularly attend have people with the same attitude. Even when most of us do have one, we'll hold back and wait for people to catch up. I'm all about puck control and I find that much more fun than a breakaway.