Re: …Not Fair…
Not really. Just because someone uses smilies and acts silly, that doesn’t mean they are immature. There are some doctors and engineers who come to cafe and act silly, that doesn’t mean they are not mature…and on the other hand there are girls who are older than me but when you read their replies in life 1, you just wanna laugh out loud because they are actually serious. So it is not true in all case, and def. not true in your and my example 
Sara ok chalo theek hai, khush ho lo