Type 1 Diabetic here. There's always concern when consuming things without knowing your carb count, and of course the additional concern when consuming alcohol.
Disclaimer: I'm not a doctor, I'm not your endo, and I'm not telling you to do or don't do something - I'm just sharing my experience as a homebrewer and beer lover who also happens to be a type 1 diabetic.
I disagree with someone telling you not to drink. It's totally possible. It's the same as someone telling you not to have a candy bar because you're diabetic. For those of you who don't know, yes we as type 1 diabetics can eat anything a normal person eats, so long as we dose insulin correctly to compensate.
As diabetics we just need to be more careful than the average person. Figure out how something affects you, then next time take it into consideration and adjust from there...whether it's insulin, choice of beer, amount of beer. It's kinda like brewing.
What I avoid:
Drinking lots of beers with higher known sugar content, like anything with Lactose I know will give me a spike in blood sugar because it isn't fermented out. When I want something like this, I drink a 3-5oz pour and monitor from there. All things in moderation.
There are certain commercial beers I've find that really spike my bloodsugar, like all of Ballast points Sculpin beers...ESPECIALLY their grapefruit sclupin. For some reason I drink one of those and my blood sugar is in the high 200s in 15 minutes. So I don't touch those.
What works for me:
I brew and drink as normal, just within moderation. Of course you know drinking too much can lead to being drunk and not being able to control blood sugars. That's not ideal, don't do that.
Most beers I drink and make, typically don't affect my bloodsugar much, if at all. Alcohol has a reverse effect on your blood sugar that carbs do (see above posts for techincal terms). From how I understand it, your liver is busy processing the alcohol before it gets to the carbs (this is very lamens terms) so my bloodsugar won't spike. In fact, I have a habit of snacking lightly while drinking if I'm drinking more than 1 or 2 beers to make sure my bloodsugar stays up. But for reference, I'm a 12-16oz pour of beer per night kinda guy. I don't typically drink more than that.
Because I use an insulin pump with a CGM and have a closed loop that adjusts insulin as it changes, I'm pretty fortunate that I can drink a beer or two and see very little change in my glucose levels.
I dunno if anything I said helps, but that's just my experience as a Diabetic for ~17 years.