Everyone who is frustrated with something on this yo-yo forum needs to take a step back from the computer, yo-yo a little, and just relax.
Let me make this clear - there is a difference between you personally following the rules and then you telling other people to follow them too. Unless you are a moderator (which no one here is yet) you should not be the one to tell other people how to post.
Rules are there for guidance but on an online forum there is only so much you can do. We will correct things when needed but from here forward if you have a problem with how someone is posting please personal message or email us - Contact@YoYoExpert.com.
Now why is correct grammar written in the rules? We want these forums to remain a professional source of information for people to later come and read. If they are difficult to read in the long run people will become tired of staying on the forum. Of course the same goes for how tiring it gets to have people that complain or yell about about other people on the forum.
There is no need to make anyone feel unwelcome - many people are new and do not know the rules. Many people are very young too and just learning. Remember this.
We want correct grammar to make things easy for others - but we are not going to attack or yell at each other to get it. Be mature and use correct grammar if you have those skills. Be a model for others to follow - that is the idea.
Now go yo-yo a little bit and relax - this is supposed to be fun. 
thanks