It seems weird that this guy will try to promote his product to the Linux community and chooses to do it by insulting its user base.
While not all Linux users have a problem with using proprietary source (and those would be their natural clients), most got attracted to the platform for the advantages of its open and freely usable code. IMHO it would do him good to understand and respect the reasons why his potential users value free-libre-open source software, and learn to communicate without disparaging them.