Seems fairly mutual then. I believe the tone of the message is to take the onus to the developer - if they had more time, or if your browser respected standard

Seems fairly mutual then. I believe the tone of the message is to take the onus to the developer - if they had more time, or if your browser respected standards moar, you would be able to visit the website without caring about which browser you use. Front-end development, with the variety of form factors and browsers can be a thankless task which not many people respect - I think their message could be far worse personally.