No, you don't need to have a disability to report web accessibility issues, I have a disability but it doesn't matter that I do anyone can still report the error.
No focus styles probably don't count as a high enough priority to consider it 'unreasonable' to accessing content. It depends upon the context of those menus too as to whether they are creating an actual barrier or just a inconvenience.
You can still report the issue but if keyboard user can disable CSS and use the site normally then it's not a major crime but might be worth informing the website owners of their legal duty as a service provider to make "reasonable adjustments".
However, let's consider the SP Blogs now there would a justified reason for filing a complaint against them take for example: Thinking Web: Voices of the Community » SitePoint
If your browser hasn't JS enabled you cannot comment on that post. This can be considered a barrier because the web author could have used server side technology to allow you to SUBMIT a comment.
Furthermore if you have JS enabled you cannot see the other comments on that page, which again raises concern because then it's also blocking the JS enabled user-agent from viewing content. If it were a UK website I certainly would be contacting the company in question.