rymer

It is likely that the friend whose sonnet had been criticised and who was called a "rymer" by "H.S." was none other than

Shakespeare's Lost Years in London, 1586-1592 Arthur Acheson 1897

August 28, 2008 at 1:15 pm jus storeetellin fer meh, i r nawt gud rymer. but dat wuz teh win.

that’s how I roll. - Lolcats 'n' Funny Pictures of Cats - I Can Has Cheezburger? 2008

For a rymer that will be tyed to no rules at all, but range as he list, may easily vtter what he will: but such maner of Poesie is called in our vulgar, ryme dogrell, with which rebuke we will in no case our maker should be touched.

The Arte of English Poesie George Puttenham

a gentlemans, a friend of mine, that loved better to be a Poet, then to be counted so, called the author a rymer, notwithstanding he had more skill in good Poetrie, then my slie gentleman seemed to have in good manners or humanitie.

Shakespeare's Lost Years in London, 1586-1592 Arthur Acheson 1897