"Jim Carlock" wrote in
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witnessed it, but it's definitely better to be safe than sorry.

This response has been rated PG13 Parental Guidance suggested.
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I don't know why so many people equate being better safe than sorry with
living in a bubble. It's as simple as knowing not to fondle your
poinsettias, not letting your kids eat them and not asking your delicate
hot young non-lebanese slave girl who just rubbed all up & down her hot
naked body with frankincense and myrrh to water them.

In the unlikely event somebody does get a rash then you don't have to
stand around with a dumb look thinking "well it can't be the poinsettia,
somebody said they're non-toxic ..." while the victim screams in agony as
little blisters on their skin repeatedly break oozing pus and dark blood
drips like boiling summer rain from their eyelids "... I wonder if I
should call poison control or Wilfred Brimley".

At any rate, diabetes (at least type-2) can cause all sorts of
neuropathies that would impair a person's normal response to avoid
potentially allegeric substances. So instead of "an allergic reaction to
the poinsettas that caused the diabetes" it's more likely that "because
of the diabetes, the victim was unable to sense the allergic substance".