not really - during the browser wars, ie had such a large share of the market that if you didn't support it, your site was considered broken, not the browser.
I think it shows that "Works best with X" can easily turn into "Works best with Y" and nobody is better at that game than Microsoft. Almost nobody can stay in business once Microsoft decides to destroy you by bundling a copycat product for free with their monopoly OS. But still it was shortsighted of Netscape to:
a) Try to get the web hooked on nonstandard behavior such as lenient parsing.
There were a few Mac users back then too. At one time they were influential enough that Microsoft had developed a port of IE to Mac.